CUET · PHYSICS · PYQ PAPER 2025
Magnetic field at large distances on the axis of a current carrying circular loop depends on distance from the centre as
- A directly proportional to distance
- B inversely proportional to the distance
- C inversely proportional to the square of distance
- D inversely proportional to the cube of distance
Answer & Solution
Correct Answer
(D) inversely proportional to the cube of distance
Step-by-step Solution
Detailed explanation
\( B \propto \frac{1}{(R^2 + x^2)^{3/2}} \) For \( x \gg R \), \( B \propto \frac{1}{x^3} \). Inversely proportional to the cube of distance.
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